/*
 * Title:        CloudSim Toolkit
 * Description:  CloudSim (Cloud Simulation) Toolkit for Modeling and Simulation of Clouds
 * Licence:      GPL - http://www.gnu.org/copyleft/gpl.html
 *
 * Copyright (c) 2009-2012, The University of Melbourne, Australia
 */

package cloudsim.power;

import cloudsim.Host;
import cloudsim.util.MathUtil;

import java.util.List;

/**
 * A VM allocation policy that uses Local Regression Robust (LRR) to predict host utilization (load)
 * and define if a host is overloaded or not.
 * <p>
 * <br/>If you are using any algorithms, policies or workload included in the power package please cite
 * the following paper:<br/>
 * <p>
 * <ul>
 * <li><a href="http://dx.doi.org/10.1002/cpe.1867">Anton Beloglazov, and Rajkumar Buyya, "Optimal Online Deterministic Algorithms and Adaptive
 * Heuristics for Energy and Performance Efficient Dynamic Consolidation of Virtual Machines in
 * Cloud Data Centers", Concurrency and Computation: Practice and Experience (CCPE), Volume 24,
 * Issue 13, Pages: 1397-1420, John Wiley & Sons, Ltd, New York, USA, 2012</a>
 * </ul>
 *
 * @author Anton Beloglazov
 * @since CloudSim Toolkit 3.0
 */
public class PowerVmAllocationPolicyMigrationLocalRegressionRobust extends
        PowerVmAllocationPolicyMigrationLocalRegression {

    /**
     * Instantiates a new PowerVmAllocationPolicyMigrationLocalRegressionRobust.
     *
     * @param hostList                   the host list
     * @param vmSelectionPolicy          the vm selection policy
     * @param schedulingInterval         the scheduling interval
     * @param fallbackVmAllocationPolicy the fallback vm allocation policy
     * @param utilizationThreshold       the utilization threshold
     */
    public PowerVmAllocationPolicyMigrationLocalRegressionRobust(
            List<? extends Host> hostList,
            PowerVmSelectionPolicy vmSelectionPolicy,
            double safetyParameter,
            double schedulingInterval,
            PowerVmAllocationPolicyMigrationAbstract fallbackVmAllocationPolicy,
            double utilizationThreshold) {
        super(
                hostList,
                vmSelectionPolicy,
                safetyParameter,
                schedulingInterval,
                fallbackVmAllocationPolicy,
                utilizationThreshold);
    }

    /**
     * Instantiates a new PowerVmAllocationPolicyMigrationLocalRegressionRobust.
     *
     * @param hostList                   the host list
     * @param vmSelectionPolicy          the vm selection policy
     * @param schedulingInterval         the scheduling interval
     * @param fallbackVmAllocationPolicy the fallback vm allocation policy
     */
    public PowerVmAllocationPolicyMigrationLocalRegressionRobust(
            List<? extends Host> hostList,
            PowerVmSelectionPolicy vmSelectionPolicy,
            double safetyParameter,
            double schedulingInterval,
            PowerVmAllocationPolicyMigrationAbstract fallbackVmAllocationPolicy) {
        super(hostList, vmSelectionPolicy, safetyParameter, schedulingInterval, fallbackVmAllocationPolicy);
    }

    /**
     * Gets the utilization estimates.
     *
     * @param utilizationHistoryReversed the utilization history reversed
     * @return the utilization estimates
     */
    @Override
    protected double[] getParameterEstimates(double[] utilizationHistoryReversed) {
        return MathUtil.getRobustLoessParameterEstimates(utilizationHistoryReversed);
    }

}
